Boots – shoes – and leggings
Patent
1982-04-26
1985-04-30
Springborn, Harvey E.
Boots, shoes, and leggings
G06F 922
Patent
active
045148031
ABSTRACT:
Methods of applying LSI and microprocessors to the design of microprocessor-based LSI implementation of mainframe processors are described. A mainframe instruction set is partitioned into two or more subsets, each of which can be implemented by a microprocessor having special on-chip microcode or by a standard off-the-shelf microprocessor running programs written for that purpose. Alternatively, one or more of the subsets can be implemented by a single microprocessor. In addition, a subset of the partitioned instruction set can be implemented by emulating software, by off-chip vertical or horizontal microcode, or by primitives. But, however partitioning is implemented, the end result thereof is to keep the critical flow paths, associated with the most frequently used instruction subset, as short as possible by constraining them to a single chip. The application of this method requires partitioning that makes each identified high performance subset executable on one microprocessor in the current state of technology, a way to quickly pass control back and forth between all of the microprocessors, a suitable way to pass data back and forth between all of the microprocessors, and a technology in which it is economically feasible to have several copies of a complex data flow and control store mechanism.
REFERENCES:
patent: 4128876 (1978-12-01), Ames et al.
patent: 4354225 (1982-10-01), Frieder et al.
patent: 4356546 (1982-10-01), Whiteside et al.
Microprocessor Implementation of Mainframe Processors by Means of Architecture Partitioning-Agnew et al.-IBM Journal R&D, vol. 26, No. 4, 1962.
Agnew Palmer W.
Buonomo Joseph P.
Houghtalen Steven R.
Kellerman Anne S.
Losinger Raymond E.
International Business Machines - Corporation
Seinberg Saul A.
Springborn Harvey E.
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